End of the Day: S&P 500 down 21.9 to 1,846.34; Dow Jones down 231.2 to 16,108.89; Nasdaq down 62.9 to 4,260.42

* In the week ending March 8, the advance figure for seasonally adjusted initial claims was 315,000, a decrease of 9,000 from the previous week's revised figure of 324,000. The Street consensus was at 330,000. The 4-week moving average was 330,500, a decrease of 6,250 from the previous week's revised average of 336,750. Click here for more color.